Suspended air-heating furnace



Jan. 8, 1952 w. A. SCHULTZ 2,582,071

SUSPENDED AIR-HEATING FURNACE Filed March 11, 1947 4 Sheets-Sheet lINVENTOR, Wilbur A. Jafm/zz ATTVJT Jan. 8, 1952 w. A. SCHULTZ SUSPENDEDAIR-HEATING FURNACE Filed March 11, 1947 4 Sheets-Sheet 2 Jan. 8, 1952W.A SHULTZ 2,582,071

SUSPENDED AIR-HEATING FURNACE Filed March 11, 1947 4 Sheets- Sheet sJan. 8, 1952 w. A. SCHULTZ 2,582,071

SUSPENDED AIRT-HEATING FURNACE I I Filed March 11, 1947 4 Sheets-Sheet4' INVENTOR, I MlhurAJc/iu/t x Patented Jan. 8, 1952 2,582,071 SUSPENDED.AIRe-HEATING FURNACE Wilbu'i" A. Schultz, Lakewood, Ohio, assignor toPerfectionStoVe-flbinpany, Cleveland; Oh'id 'a corporationef 011m:

Application Manchal l, 1947; SeriaINo: 733384 1" 8 Glaimsw (Cl.

This. invention. relates to iheating .apnaratus. MoreparticuIarl y; ithas todogwitl'l heating apparatus of they type known assuspendedlfurnaces. Furnaces of thi'skind are: adapted. to :bel'hu'ng. from.overhead. supporting meansv orice'ili'n'gs leaving-the floor space.therebelow unobstructed; and thereforev available 'for various uses.Accord.- 2 31,..suspendedfurnaces .are especially suitable. forvlargepoem-space heating. of stotes,..sma1l fac.-. tories,,. garages; service..sta'iiions,v warehouses. schools; etc. v.Byreason of.the' naturehofsuch fgurnaces, .fl'uid fuel isv preferable for, use .thereinl. Infmy.case,.Il desire .to use, liquid .fuel). particularly of .a grade knownasfuel oil;

An object of the invention is, theproductionof a... suspended furnace.of improvedidesignand con..-' struction,affordingamong others, the;following. several. advantages; compactness; l. lightness; :ofweightlilistrength. and. rigidity of .structure.; sime. plic'ityandche'apness of installation; econonmoj;v operation; high elficiency andquick heating; durability}: convenient clear-1mg-of parts exposed to theproducts of combustion, and.,ready acces' sibility to all partsrequiring servicing.

' Another-obiectof-theinvention is tWsod-i'spose the refractorylinin'gmf the combustion-chamber as to'protect the areas 'of=the*sheetmetalwal-ls ofsaid -chamber,= whoseoutersurf-aces=-are notins-thedirect -path"05 the circulating air, -i-rom deterioration -bytheiintenseheat of the burner fiameyand' tO l GaR B GXPOSBd tO- SaTd heat the areaswhosaoutersuriaces arezwipedebythe. circulating? air and are. thus;-keptqfroml reaching injuniouslys high. temperatures: while by: reasonof. this. same: condition, heat transfer betweengthezz encloseueprpductstof combustion andzsai dlcirculating .air is..enhanced.... I v Ir I Another obiectis to provide. a: liningtf oit thei combustion chamberthat is. quick vancl.especially convenient of installation and. that. ismadelupyqf refractory members shaped to interengagefl with oneanotheninsuch manner. asto-"holdior lock them in i place; thereby to" render"unnecessary the use ofcementor sealin'g'material'.

'I p'refeFto-usea pressure 'atomi'zing liqui-crfuel" burner? desirably"of' the gun'type; fbrfiriirg the furnacepand itis-a; further object ofmy'='i !Wentiomto. reducejto aminimumthe..flamerpulsationi thattiiszcharacteristimpicsuchirbumers; and; I- accomplishrbymaintaining:vaneespecial'ly high; temperaturevin theicomhustion':chamberr duettotheiusev of. refractories of. high insulating; uality. andlbyproriuing;also, .controlledlpressur .reliei. forzsaidchamber. Morespecifically,one or more. openingsaare' pnovided.;in. the: enclosure. oilsthe'.

combustionspaee, andeachjsuchppeningis.

, 2 tially. closeduby a quantity. oi..efibrousaz-matenials preferablysteelwo'ol'. Thuszpressureawavesofiyi mating in. thexzcombustio'nchamber Z8SIZEIIEHGVG'CI without undue lossof heat-.3

A further object isprouideiza furnace=:.:con.-:. struction,thatrisreadily reversible-so :astoadap 2 it -to1eitherzsrikght .orlefitxhami? ;:msta1'l'ation. reason ofthis feature; the: furnacemayizrbe. sembl'ed-for servicingtrommne sideircrr the othe This obj ect'attainedubymakinglthecombustione chamber-radiator.iunitzssymmetrical.-2;b0\l67-.811d; below its horizontal :centrakplanezso thatpitlmays be--tu-rned .-.over.-with .respectztoathez: casing; making the oppositeside. panelsaof the'xcasingz m terchangeablew and by :provi'di ngsaburnem'zum and arefractory lining' fon the: combustion bet that areadaptable to both. positionsz. combustion chamber radiator' unit:

A stillfurther and more:detailed'i'obleciixof the: inventionis "toincorporatesin; the :bottomzzof :the; casings-along each: side thereofstiitiwbeamr ion channel; I The: beams- 01 2 channels support-.- the:weight of the combustion chambereragdfauo eunit' audits appurtenances;as: :we'll as-xtheremai'ndeiti. of the: casing; etc and it 'is. tothesez beams or channels that :the turnaeeuspension elements or hangerbolts are anchored-a v Air additional obj ect-is to provide for convene:lent and economical installation, =at =a-ny. as well asremovabilityfor""clcaning;of a' w'atenh'eaii mg element-7 and tease 'Iocatethe'same-as to protect 'itfrom extremely'high temperatures while insuringefiectual he'at interchangebetween; the products 'ofcombustion-andthewater.

The-foregoing objects and advantagesp with others that-will appear asthl's description; pro ceeds, areattained in the-embodiment oi myinvention illustrated in theaccompanyingdraw mes-wherein lilie referencecharacters=:-designate: like parts 'throughout the"-"-several-"viewszthe drawings; "Figi 'l {is a perspectiveView; of the furnace withcertain Eof" the"*sifde "panlf sbroken" "awayto reveal-thepartsenclosed; Fig: 2 is a vertical" central longitudinal sectionthrough the combustion chamber-radiator un'itfi'jron'. the line 2-2 of3; Eig,.3 is a. horizontal central" longitudinal sectionthroughsaidunit. on the line. 3 -23 of'Fig. 2 Fig. 4 is at verticaltransverseaction through the furnace on the center 1111.61 of the.combustion chamber, the" plane ofisection being. indi'catedby the lines4i4. o'f"Fig's'. 2. and 5 is, asimilar sectional view'in a planerepresentejii' tl'ie'lines'ie-5 of Eigszi and fi; :Figgxfi is 'a pert-1spective view .of therefractory lining, ion-lthel conie' liiustionchamber,..with. 'a. part .or oneofath'e} side CASING 4 (Referencenumerals 1 to 46) With particular reference to Figs. 1, 4 and 5, thefurnace casing is made up of a bottom wall, designated generally by thereference numeral I, a top wall 2, and endframes 3 and 4. Each of saidframes has a relatively large opening that iszlsurrounded. byflanges,the -flanges of,

frame '4 being shown at 5 in Fig. 1.

A' partition a, situated about one-fourth the length of the casinginwardly from the end frame 4,f'separatesw.the' interior of the easinginto a heating compartment l2, and arelatively smaller a'ii'j. impellercompartment. I4. The foregoin parts of/the casing are suitably connectedtogeth'er to form a comparatively rigid structure; and'strength andstiifness is imparted to the bottom wall Lin order to constitute of it aload support, by beams orchannels l5 and I6 that extend the entirelength of the casing. As best shown in Figs. 4 and 5, said bottom wallis con-' structedof a sheet of metal, designated [8, that is. engagedwiththe underneath surfaces, of the channels I5'and l6, and the edgeportions of said sheet are extended upwardly along the outer sideflanges of;the channels and thence inwardly over the same and againupwardly to provide flanges 2B.; The bottom wall I includes, also, aliner 22 of sheet metal that extends across grooves formed by saidflanges and 30 and the adjacent right angle portions of the respectivesheets [8 and 26. The opposite side of the casing is normally closed bya relatively wide, double Wall central panel 35 (Fig. 1), and bynarrower panels 36 and 37, the panels 35 and 36V closing the -side ofthe compartmentlz, while the panel 3'1. closes thGSld .of thecompartment M. The latter panel, and asimilar one that closes theopposite side of said compartment,

for reasons which will presently appear, are desirably made convenientlyremovable by following the common expedient of equipping their upperends with parts that interlock with the sidesof the top wall, and theirlower ends with latch means 38 that cooperate with adjacent parts of thebottom wall. The panels 35 and 36 are fitted within the side of thecasing and are connected thereto in the manner of the previouslymentioned side panel 33.

Spaced inwardly a suitable distance from each end of each channel [5 andI6, is an anchorage member 40 which, according to the presentembodiment, consists of a downwardly opening short channel that isdisposed between and'is welded at its ends to the side flanges of thecorresponding one of the first mentioned channels. Secured as bywelding, to the underside of the web of the short channel is a nut 4 l,and said web has venient attachment theyspaceiibetween the channels[Sand 16, in'

parallel spaced relation to the sheet l8, and along its lateraledgessaidliner is extended up alongside the inner flanges of thechannels and then across the channels to where they are flangedupwardlyandengaged with theflanges 201... of the sheet l8. Each end of the sheetI8 is turned upwardly to provide a flange 24 (Fig. 4i thati overlaps thecorresponding ends of, the channels 'Thus it will be seen that, by theinclusion of the beams or channels'l5 and I6, and the manner in whichthey are embraced by the-edge. portions of the; sheet 18 and liner 22, avery strong, stifi' load support is provided.

The-top wall 2 is fabricated of a metal sheet 26, and a liner 21.0fsimilar character. The lateral edge-portions of the sheet 26 are turneddownwardly and, thence inwardly and again downwardly to provide flanges30,,while the edge portionsoftheliner 21 are turned directlydownwardlyalongside the flanges 30, .to which they are securedibyscrews3|, the liner elsewhere being disposed in parallel spaced relation tothe sheet Mi. I i a 'Withthe walls 'I and 2 thus constructed andsupported in vertically spaced relation to each other by the end frames3 and 4 and partition 8, openings are left along the opposite sides ofthe casing. The openside of the heating compartment l2 on one side ofthe casing is closed by'a double-wall panel 33, that is held in place byscrews that are extending through the panel and" the fianges'zu and 30,the top and bott om edges of the panel "occupying the 'rabbetted anaperture that registers with the threaded bore of the nut. The top wall2 of the furnace casing has apertures 44 in vertical alignment with theanchorage members 40, and extended downwardly through the apertures 44are suspension elements or hanger bolts 45 which have their threadedlower ends screwed into the; nuts 4|. Said elements or bolts are shownas termi nating at their upper ends in hooks 46 for conto overheadsuspension means. COMBUSTION CHAMBER-RADIATOR {UNIT (Reference numerals50 to'90) Occupying the heating" compartment I2 isja 3 combustionchamber-radiator unit that is des ignated generallyby the referencenumeral 50. The combustion chamber of -said unit is made up in part of acylindrical wall 5| and a circular end wall 52 that is permanentlyconnected, as by welding, to the rear end of the cylindrical wall 5|.Similarly secured to the opposite end of said wall is a flange 54,provided with threaded studs 55 that are spaced apartcircumferentiallyof said flange. Applied to the flange 54, with a gasket 56 interposedbetween it and said flange, is the edge portion of the circular frontwall 5'! of the combustion chamber. Said front wall is provided withholes through which the studs are projected, and

nuts 58 are applied to the studs to securely hold said wall 51 to theflange 54. The wall 51 is provided with an opening 60, and secured tosaid wall about the opening fillisa substantial frame member 6| to theouter end of which is fastened a bracket 62, mounting a'pressure,atomizing, liquid fuel burner of'the gun type, designated generally bythe reference numeral 65. Inasmuch as the burner, per se, forms no partof the presanemone tween; the member 61 anw the n0ZZ-1B 651 "Th@ action::of r the burneris automatically" governed by the usual electricalcontrol system (not shown)- 1 including-la room thermostat; Y I

1 'Thez:combustible' mixture of atomized oil-A and: aim is projectedinto the combustion chamber withinxan "enclosureof'a, refractory liningthat side-members l4 and have overhanging pot-,1

tions 18 at their upper corners that bear-on,

horizontal ledges'ofv the front andxrear'memhersi.

l0 and I3 outwardly beyond their'ex-tensions 1.6" and TI.Theoutersurface of. theside members conform to the shape of thecylindrical wall 51. Considering the manner in which-these members 0.!the refractory lining interengage one another, ihifiapparent that theside membersareheld'in placetbr the and members, and that the end, a

members aretpreyented from tilting toward each other by the; portions,of the side members. that extend between, them. The side members extenda; cQmparatively short distance above and below the;; horizontalcentral-plane oi the combustion, chamber while the. end members contactthe peripheral wallet said; chamberthroughout the, extentof theirsemi-circular portions. The lower portion, of thafijont member 10 isheld in place between-thefian-gejd' anda lug 8 0 thatjiswelded; orotherwise-attached to, and rises from, the bot: tom of the combustionchamber, and the lower portion of the-rearmember 13, is confined.between spacedlugst l; and 82. that, are similarly fastened, toiandprise from the, bottom of said chamber; Diametrically opposed lugs, 8.3that are carriedby the sidesof the, combustion chamber reStraintheQrear-member 13 from tiltingabackwards. I may mention, passing, lugs 80 8It and 82 that are attached wand-depend from the top of the combustionchamber in the vertical planes of the, respective-lugs 80, B l and 82-,and the purpose oi} which-will. presently appear. v

.Aspreyiously/explained, the combustible mix? ture isprojected'fromthenozzle 66 of the burner. iii-into the enclosure 01 the refractorylining, and the; condition-of the flame may be observed. throu h, a,sight tube '85, whose inner end opens through: the; front wall, 51 ofthe combustion chamber, while ithe.;front end or said tube opens;thr'ougbLthe panel where it is fitted with a. closure-8'|', including avtransparent central portionr The combustion chamber is vented to theatmosphere through a passage 88 between the upper-portion of thecone-shaped member 61 and the top portion of the-frame Bl, andfiuid flowtherethrough' is checked or retarded by a massof 'iibrous material; suchas "steel woo1,- designated 90 that is confined within theouter-portibrr-of's aid'passage 88 between suitable screenlike 'orperforated-retainers; This controlled ventfor pressure waves that arecreated within the combustion: chamber, plus the high flame temperaturemaintained; by the heat insulating refractory lining: 'reducesto aminimum the-flame pulsatiomicharacteristie iorgazpressuree-zatomi-zinmzliquid .tuel-lbu'rnersiof the egnn types: Y

(Reierence numemiafi v,to 5138a.

Turning np'wto the;radiator-'politioirofsai jti iil' BOf'the" same i'scomposeal of a plural-itycrse tions; three; in the' presentembodimentfancl,

shall designate-.them the rearsection-9'5 intermediate "section 96'-and-"front. section 9 Eachsectiorr is made upof-itwo shells that raredrawn from, :sheet metal and; are arranged withwtheiv open sidestoward-each;otherand *theiredgepoi tionsgengaged and "welded together.Each-shell; throughout: its central region; is "depressed wardly intorather close proximity tothe corre spending 'area' of the other she-ll,and'by' reasom oi this formationof the shells, the greater -quail utyof" the;productsof combustion that-arachculjatedfthrough' the1radiatonsectionsis confined to theperipheral'portions-thereof.Therearradl ator section- 1s; longer; tha-n-the others; its left h nd:end .(as' the'partsare viewed in Figs; 2; and 13); is shapedto conformtothe-cylindric wall '5'! of; theacombustion chamber; Said-waprovidedwitha segmental slot llJWinto-whiclrthe? end or said radiatorsectionis projected-g and said section i Prop r r s neirwith respe fl flfi z wall 5fliby'arcuate beads" [=0 l-.'

'Ifhe front' wall of the rearradiator' section adjacent-its and; remotefrom combusti'ejn;v

chamberyisproyidedwith a relativelylarge-opem mg thatis; in axialalignment with anxopemng ofi corresponding sizein; the'rear-walt oftheintem mediateradiator section--86: andthe front walb of, the: latterSfififiiOllfhfiS' a somewhat-smaller opening. in axia'l alignment with--the openingdn; it "reariwalllh ea smaller "ope m; "isaligned with asimilar 'size-" pening: in the sear: wlanloi the 'front radiatorectiem-anwthe-fim wall of; the; lattersectiomhas an opening axial 1alignemwithtthe former openings and=of a sizecorresponding" to thelarger' ones thereo-fi Therear radiatorsectioncommunicates-withtermediate sectiongthroughfa short-r'conduit or SQBCEIHQCT stubl,U5..j"Which"ha-s-its*ends welded or otherwise secured to the front andrear walls ef the respective; sections in registerwiththe aforeg;saidgopenings;thereof; jand"the intermediateand frontlra iator sections;c mu ate "thron stub. 105. of" somewhat smaller; diameter-whit has. i s.v.enc'ljsgsimilarly attached tothelrfront and r erlwalls c1111? n zesntisectmnsii r gister with:- their small r epe iin s; ,Attachedstoth-:f'rontr wa goisth lsectionfli n.reei t w ebe req,

mentioned opening; t ereof; bis what may-- be termed-a an'eut. s ub; 01,"f'The" ends; ofth int mediatli and'gfront. radiator sections a; acente-col ima i n c amber communicate :witIra hi lfl that has ends-litenedtg th' T pposedj; walls'fofsaidsections about openings therein; andaxially aligned with the? stub 1T0 what'maybetermed-a flue stub orwcon"nectio'n 'I Hthat is attached to the frontstair-33f the radi'aLtrsectiDnS-Pin register withan open-ing' peripheralgwalli of thecombustionchamber- --by=- a bridge'member H3 that is welded orotherwise- I secured to said walYandto-the radiator section;- Access ishad toatheinterior-011 the radiator at its end remote from.they.combustionlchamber,

. for cleaning as well as other purposes, through the cleanout stub Hi lT 1 stub equipped with aremovable cap H5. Said cleanout stub,

as well as the flue stub or connection H2, project through apertures inthe panel 35 that are surrounded by collars 'I I6 and H1.

The cap is frictionally' engaged'within the outerend of the cleanoutstub I01 and it is desu mymaae with a vent opening to relieve pres surewaves that are transmitted from the coni bustion chamber to theradiator. To this'end,

the cap isprovided with a relatively large central opening across whichis supported a mass of latlon of a water heating element or coil at anya time. Such an element or coil, as an appurten-' ance to the furnace,is shown in Figs. 2 and 3.

Said element or coil, designated I30, has laterally extended terminalportions I3I that form the water inlet and outlet, and the element orcoil is adaptedto be projected into said cross passage through thecleanout stub I01 until the portions I3I engage the front end of saidstub. This dis poses the rear end of the element or coil closelyadjacent the radator section 95. A tubular extensionv I33, notched atits rear end to accommodate the terminal portions I3], is telescoped'into the stub I01. A support I34 that is attached to the rear end of heelement or coil I rests on thebottom of the stub I05. Under. thecircumstancejust described, the cap I I5 is fitted into the outer end ofthe extension I33. 1 It is apparent, therefore, that not only can thewater.

heating element or coil be conveniently installed, but it may be removedwith equal facility for cleaning; or replacement without disturbing thefurnace structure in any way. V I

The combustion chamber-radiator unit is connected to and supported fromthe beams'or channels I5 and I6 by legs I35,and I36, the former beingsecured to and depending from the front-and, rear ends of the combustionchamber, and the, latter being attached to and depending from the frontand rear sections of the radiator adjacent the end'there'of remote fromsaid cham-, ber. Thelower ends of said legs are fastened by bolts I38 tothe inner flanges of the channels I5 and I6, as best shown in Figs'.'4',5 and 7; and in-orderto prevent strains and stresses bein'g'set upwithin said unit when itis ca'usjedto expand and contract due to extremetemperature changes.

to which itis subjected from time to time; and I to avoid the noisesattending such'conditions, readily yielding connections are made betweencertain of the aforesaid legs and the channels I5 and I6. This 'end isattained in the present instance by making slots in the flanges of thechannels I5 and I6 through which the bolts I38 extend that connect thelegs I36 to said flanges.

for this will casing I4 I.

83%. compartment I2 from the air impeller compartmerit I4, is providedwith a relatively large cir-v cular opening, I40, and secured to thepartition in register with said opening is a cylindrical The end ofsaidcasing adiacentthe partition is provided with aflange that issecured by fastening means I42, such as screws .or bolts, to thepartition. A relatively large fan I45, of the propeller type, isrotatably supported byv and within the cylindrical casing I4I, andv isdriven, through a belt I46, by an electricmotor I48 that is mounted inthe lower portlonof the compartment l4 adjacent the side of the furnaceon which the burner, flue and cleanout arelocated, so that the furnacemay be, serviced entirely fromone side. Access to the motor, as

well as to thefan, is had through the open side of the casing when thepanel 31 is removed.-

-While I have shown the air impeller as consisting. of a more orlesscommon typeof axial flow fan, such being desirable in thepresentconstruction, it will be understood that othertypes of airimpellers may be employed without .de-, parting from the invention.

' ASSOCIATED EQUIPMENT (Reference numerals 150 to 162) Attached to theend frame 4 of the casing I is a filter housing I50. The Wall I5I ofthis housing that is opposite the end frame 4 is provided with a largerectangular opening I52; and arranged'in zigzag fashion within thehousing are frames I53 that support air filters I55.- These filters maybe of any approved character, such as those in common use which are mad'offiber glass or the like confined within inexpensive holders. The sidepanels I56 of the filter housing are readily removable, being made tointerengage at their upper ends with the adjacent edges of the top ofthe housing, while their lower ends are provided with latches I51 bywhich they are held to the ends of the bottom wall I58.

Fastened in any approved manner to the end frames 3 of the casing I is aplenum chamber I60 from which, by-suitable ducts, the heated air may bedistributed as desired. A fiue I62 is connected to the flue stub orconnection II2 With the burner 65 in operation, the products ofcombustion will fiow over the refractory lin-' ing member 13 and intothe rear radiator section and thence through the stub I05 to theintermediate radiator sections 96. A part of the products will circulatethrough the section 96 While the remainder will pass on through thesomewhat smaller stub I06 to the radiator section 91. Circulatingthrough the lattersection, said products will be joined by thoseescapingfrom the intermediate section through the stub I I0 and all willescape through the stub or connection II2 to the flue. While passingthrough each radiator section, the greater volume of the products .willtend to follow the peripheral por: tion of the, section for reasonsalready explained, Due to the high temperature of the products as theyescape from the combustion chamber, the rear radiator section 95 isdesirably made of heat-v resisting non-corrosive chrome steel, the sameas the metal walls of the combustion chamber.

With the air impeller in operation, cool air is drawn in through thefilters I55 that are sup ported. within and across the housing I50 andis forced through the casing I about the combuss o e m er ra at ni Thecirculatingair will wipe allsides of all of the radiator sections andpass over, beneath and about the ends .of

.theicombustionchamber; with the :tWOrfQldr efiectof-causing the air tone-highlyheated-rand preventing the portions cf :the walls of theunit 50wherewith the air contacts, fromattaininginjuriotisly:zhighitemperatures. As the air stream, havingpassed the radiator, divides and flows over and under-the cylindricalcombustion chamberand merges again therebeyond, substantially deadair*pockets are created along the sides of .said chamber in the region of'its'horizontal cen-.

550. is made symmetrical. above and belowrits central horizontal planeso that it may be inverted, in which case the legs I35 and 136* arefastened, by the bolts I38, to the beams or channels I 5 and I6. Also,the end wall 51 is inverted with respect to the combustion chamber sothat, in its new position, the parts associated therewith are in theupright position they previously occupied. Such a conversion of thefurnace obviously re quires removal and replacement of the burner 65,Wall 51, and the parts of the refractory lining, in which case, with thecombustion chamber casing inverted the lower portions of the front andrear members and 73 are now held in place by the lugs ill and 82*. Tocomplete the reversal of the furnace, the side panel 33 is interchangedwith the panels 35 and 36, and the motor M8 is shifted to the oppositeside of the compartment l4.

Having thus described my invention, what I claim is:

I, 1. In a furnace construction, an elongated rectangular casingincluding top and bottom walls, an invertible combustionchamber-radiator unit supported within the casing, the correspondingsides of the combustion chamber and radiator having, respectively,provisions for the accommodation of a burner and a flue connection, andclosure means interchangeable between the two sides of the casing, saidmeans for one side having openings for the burner and flue connection.

2. In a furnace construction, an elongated rectangular casing includinga top Wall and a bottom wall, means for supporting said casing in a substantially horizontal position, an invertible combustionchamber-radiator unit supported in the tom :walhrmeansfor supporting,said .casingin "a zsubstantially horizontal xposition, an. invertiblecombustionwchambereradiator unit sup orted :,in the. casing. theradiator of I said vunitaincluding. 5a flue; connection and a :cleanoutstub on :one side thereof, the wallyof "the, combustion chamber-on:thercorresponding side :ofthe unit :being detach- :able-andrbeingreversible with respect to the-unit,

aiburner supported :in fixed relation 3 to .said detachable wall, asection refractory lining remov- --ably, supported within the combustionchamber and capable of being reversed with respect ,to-the chamber,closure means interchangeable between the; two sides of, the casing, theclosure means for one side having openings for the accommodation 10f theburner, iflue-connectionna'nd cleanout stub,

arranged aside .byside in-spaced relation to each other, the sectionsbeing relatively thin and of a width substantially equal to the diameterof the combustion chamber and of a length considerably greater than saiddiameter, said radiator sections being arranged in parallel spacedrelation with the sections lying in vertical planes normal to the axisof the combustion chamber, one of the end sections of the radiator beingextended and joined to the cylindrical wall of the combustion chamberadjacent an end of the latter, the remote end of the combustion chamberhaving an opening for the accommodation of a burner, a fluid fuelpressure burner of the gun type supported in a position to project itsprodcasing, the radiator of said unit including a flue connection on oneside thereof, the wall of the combustion chamber on the correspondingside of the unit being detachable and being reversible with respect tothe unit, a burner supported in fixed relation to said detachable wall,a sectional refractory lining removably supported within the combustionchamber and capable of being reversed with respect to the chamber, andclosure means interchangeable between the two sides of the casing, theclosure means for one side having openings for the accommodation of theburner and flue'connection.

3. In a furnace construction, an elongated rectangular casing includinga top wall and a botucts through said opening into the combustionchamber, the opposite end section of the radiator having a flueconection adjacent its end nearest the combustion chamber, stubs in theform of short conduits communicatively connecting together the ends ofthe radiator sections remote from the combustion chamber, said stubsbeing substantially in axial alignment, the last mentioned end sectionof the radiator having a cleanout opening aligned with said stubs, aclosure for said cleanout opening, and, an air impeller for moving airthrough the casing in a direction to first pass about the radiatorsections and about the combustion chamber,

5. In a furnace construction. the combination of elements set out inclaim 4, plus: an elongated water circulatingelement adapted to beprojected into the radiator through said cleanout opening and to beaccommodated by said stubs.

6. In a furnace construction, a casing includ-' ing top and bottom wallsand detachable side panels, beams extending along and incorporated inthe lateral edges of the bottom wall, elongated suspension elementsinwardly of the side panels and spaced apart along each beam and havingtheir lower ends anchored thereto, the top panel having aperturesthrough which the upper ends of the suspension elements are exposed forconnection with external suspension means, and a combustion chamber andradiator attached to and supported by said beams inside the casing.

7. In a furnace construction, a casing includ ing top and bottom wallsand detachable side panels, end frames rigidly connecting said wallstogether in vertically spaced relation, a channel extendingalong andincorporated'ineach lateral 3 wardly of the side panels and having theirlower ends secured to said anchorage members, anda combustion chamberand radiator in the casing I attached to and supported by said channels.

8. In a'furnace construction, a casing comprising top and bottom walls,end frames rigidly connectingsaid walls together in vertically spacedparallel relation, an upwardly opening channel extending along andincorporated in each lateral edge of the bottom wall, anchorage memberssecured to and bridging each channel, one in tures and havingtheir-lower ends threaded and screwed into the holes of the anchoragemembers, a combustion chamber and radiator in the casing attached to andsupported by s'aid'channels,and side panels for the casing supportedbetween the lateral edges of the'top and bottom walls.

WILBUR A. SCHULTZ. 7

REFERENCES CITED The following references are of record in the file ofthis patent:

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